[issue24313] json fails to serialise numpy.int64

[R. David Murray]

R. David Murray added the comment:

So in python2, some were json serializable and some weren't?  Yes, I'd call that a quirk :)

So back to the question of whether it makes sense for json to look for __index__ to decide if something can be serialized as an int.  If not, I don't think there is anything we can do.

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